Chemical Engineering MCQs

Page No. 432

The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by_______________?


aForced convection

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bNatural convection

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cTransient conduction

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dSteady state conduction

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View Answer Transient conduction

Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for_________________?


aCube

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bCylinder

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cSphere

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dEqual for all the three

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View Answer Cube

Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?


aDittus-Boelter equation

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bSieder-Tate equation

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cNusselt equation

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dNone of these

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View Answer Sieder-Tate equation

For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then__________________?


ahf = hd

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bhf > hd

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chf < hd

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dhf could be greater or smaller than hd

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View Answer hf < hd

Heat transfer in the laminar sub-layer in case of a liquid flowing through a pipe, is mostly by__________________?


aEddies current

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bConduction

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cConvection

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dNone of these

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View Answer Conduction

_____________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?


aSingle pass, fixed tube sheet

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bU-tube

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cThree pass, fixed tube sheet

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dNone of these

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View Answer U-tube

Evaporation of 1kg of water from a solution in a single effect evaporator requires about ________________ kg of steam?


a0.4 – 0.6

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b1-1.3

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c1.8-2

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d2 – 2.4

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View Answer 1-1.3

Thermal conductivities of most of the liquids _______________ with rise in temperature?


aIncreases

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bDecreases

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cRemains unchanged

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dMay increase or decrease; depends on the liquid

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View Answer Decreases

The purpose of providing a ‘catchall’ in the vapor line of an evaporator is to__________________?


aCreate vacuum

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bRegulate the vapor flow

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cVent the non-condensable gases

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dArrest the entrained liquid

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Removal of ______________ heat is involved in the condensation of a vapor under saturated conditions?


aSuper

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bSensible

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cLatent

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dBoth B. & C.

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View Answer Sensible

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